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Units of solid angle

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1. Homework Statement
What are the units of solid angle in other systems ( In SI, it is steradian)


2. Homework Equations



3. The Attempt at a Solution
 

Answers and Replies

Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,598
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The solid angle is technically dimensionless, i.e. it has no real units. It is simply 'assigned' the SI unit of 'steradian' to distinguish it from other dimensionless quantities, such as constants etc.

Therefore, the solid angle has no alternative units other than SI.
 
HallsofIvy
Science Advisor
Homework Helper
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The first thing I did was use good old "Google" which sent me to Wikipedia:
http://en.wikipedia.org/wiki/Solid_angle
where I learned that the corresponding units are "square degree" and "fractional area" (what fraction of a circle does it subtend?).

I agree with Hootenanny that a solid angle (like any angle) is dimensionless but it appears there are other "assigned" units.
 
Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,598
6
The first thing I did was use good old "Google" which sent me to Wikipedia:
http://en.wikipedia.org/wiki/Solid_angle
where I learned that the corresponding units are "square degree" and "fractional area" (what fraction of a circle does it subtend?).
I wasn't aware that there were other 'assigned' units for the Solid Angle, I guess I should google more often! Thanks Halls!
 

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